This study was sponsored by the Bureau of Mines as part of its ongoing subsidence research program. The study involved installation of surface survey monuments over a room-and-pillar panel in southern West Virginia, eastern coal province. Monitoring was conducted for a period of 6 months. Maximum subsidence was 1.48 Ft and occurred near the center of a two-panel span, one of which was monitored as part of the study and the other adjacent to it. This is equal to 31 pct of the extracted coal height. The angle of draw over the pillared panels was 24 deg. The width-to-depth ratio over the pillared panels was 0.85. A maximum surface horizontal strain of 0.003 Was detected near the center of the monitored panel. The overburden lithology consists of interlayered sandstone, shales, and coal with 50 pct of the overburden being sandstone layers 5 ft thick or greater.
CP; Final Contract Report;
NTIS Accession No.
NTIS: PB 84-220177. Available for Reference At Bureau Libraries
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